How many Germans would you have executed in 1945? A third of Germans voted for Hitler 1933 and many more supported the Nazis materially and socially in the decades since.
So would you let Auschwitz run for another couple years while shuffling 10 million Germans into the gas chambers? 25 million? 50 million? What would you do with the millions of children you orphaned? What of the children who are swearing revenge? Do you wait for them to turn 18 before sending them to the gas chambers?
Nazis don't deserve the bullet. The bullet is often the best we can give them, but it also often isn't. Daryl Davis did good, and there is a decent chunk of leftists who had a "Nazi phase" because they had to learn solidarity by themselves and I'm glad they got out, whether it was by their own power or by people choosing to help them.
I wouldn't blame anyone for deciding a Nazi isn't worth the effort and giving them lead instead. I wouldn't even blame people for saying Nazis are inhuman or deserve the bullet as coping mechanisms when fighting Nazis in a necessary war.
But if we have the time, then let us see them as people who don't deserve the bullet but who endanger others so much that a bullet is an acceptable solution.